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Zoom lens for digital image capturing apparatus

a technology of zoom lens and digital image, applied in the direction of optics, optical elements, instruments, etc., can solve the problems of not providing the desired properties and the number of lenses, and achieve the effect of high resolution

Inactive Publication Date: 2006-04-18
TRANSPACIFIC IP II
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The design achieves a compact size, high resolution, and improved brightness and angle, reducing the lens set length and production costs, while maintaining a high F / # of 2.5 and a 75-degree field of view with reduced distortion, suitable for digital cameras.

Problems solved by technology

However, they cannot provide the desired properties such as large F / #, large field of view (FOV), the zoom ratio, and the number of lenses.

Method used

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  • Zoom lens for digital image capturing apparatus
  • Zoom lens for digital image capturing apparatus
  • Zoom lens for digital image capturing apparatus

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Embodiment Construction

[0013]As shown in FIGS. 1A to 1C, the disclosed zoom lens, from an object plane (whose image is to be taken) its image plane, has a first lens group 10, a second lens group 20, and a third lens group 30. The first lens group 10 has a negative refractive power, the second lens group 20 has a positive refractive power, and the third lens group 30 has a positive refractive power.

[0014]As shown in the drawing, this embodiment of the invention only uses six pieces of lenses. The total length of the lens set is thus shortened.

[0015]In this embodiment, the first lens group 10 has a first lens 11 and a second lens 12. The second lens group 20 contains a third lens 21, a fourth lens 22, and a fifth lens 23. The third lens group 30 includes a sixth lens 31.

[0016]In the first lens group 10, the first lens 11 is a negative lens, the second lens 12 is a positive lens. The surface of the first lens 11 closer to the image plane and the surface of the second lens 12 closer to the image plane have n...

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Abstract

A zoom lens for digital image capturing apparatus is a shared lens of digital static cameras and digital video cameras. It contains three lens groups. From the object plane to the image plane, the first lens group has a negative refractive power, the second lens group has a positive refractive power, and the third lens group has a positive refractive power. As the focal length of the zoom lens changes from long (telescope) to short (wide-angle), the second lens group moves from the object plane to the image plane. The third lens group and the first lens group move with the second lens group.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The invention relates to a zoom lens for digital image capturing devices, such as digital static cameras and digital video cameras. In particular, it relates to a zoom lens with a more compact structure, a higher picture quality, a high resolution, and a wider angle. The disclosed zoom lens further has the properties of a high relative illumination and a small incident angle. This is particularly suitable for devices capturing digital images, such as CCD.[0003]2. Related Art[0004]In recent years, the research and production of zoom lenses have made a great progress. Besides advances in their performance, the zoom lenses are also designed for the convenience of users. Manufacturers make all efforts to lower the lens production cost and decrease the lens set length in order to enhance their competitive power. In particular, the zoom lenses for the digital static camera (DSC) and the digital video camera (DVC) have the greates...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B15/14
CPCG02B15/177G02B15/143507
Inventor HO, GUNG-HSUANCHANG, CHIR-WEEI
Owner TRANSPACIFIC IP II